Lubricating Compositions

Abstract

The invention provides a lubricating composition containing hydrocarbyl-capped polyoxyalkylene polyol. The invention further provides lubricating compositions containing the hydrocarbyl-capped polyoxyalkylene polyol; and a method for lubricating a mechanical device with the lubricating composition.

1 . A method of lubricating a mechanical device with a lubricating composition comprising:
 (a) about 1 wt % to about 99 wt % of the hydrocarbyl-capped polyoxyalkylene polyol, wherein the hydrocarbyl-capped group of the polyoxyalkylene polyol comprises a residue of -a mixture of linear monohydric alcohols selected from the group consisting of dodecanol, tridecanol, tetradecanol and pentadecanol,   wherein the hydrocarbyl-capped polyoxyalkylene polyol comprises about 0 wt % to about 80 wt % of ethylene oxide, and an alkylene oxide containing about 3 to about 8 carbon atoms present at about 20 wt % to about 100 wt % of the hydrocarbyl-capped polyoxyalkylene polyol, and   wherein the hydrocarbyl-capped polyoxyalkylene polyol is present in the lubricating composition at about 50 wt % to about 95 wt % of the lubricating composition; and   (b) about 0.1 wt % to about 5 wt % of a phosphorus-containing acid, salt or ester, or mixtures thereof.   
     
     
         2 . The method of  claim 1  wherein the hydrocarbyl-capped polyoxyalkylene polyol is a mono-capped hydrocarbyl-capped polyoxyalkylene polyol, a di-capped hydrocarbyl-capped polyoxyalkylene polyol, or mixtures thereof. 
     
     
         3 . The method of  claim 1  wherein the hydrocarbyl-capped polyoxyalkylene polyol is derived from a homopolymer of an alkylene oxide. 
     
     
         4 . The method of  claim 1  wherein the hydrocarbyl-capped polyoxyalkylene polyol is derived from a copolymer of two or more alkylene oxides. 
     
     
         5 . The method  claim 1  further comprises a non-phosphorus extreme pressure agent, or mixtures thereof. 
     
     
         6 . The method of  claim 5  wherein the non-phosphorus extreme pressure agent is selected from the group consisting of a boron-containing compound, a sulphur-containing compound, and mixtures thereof. 
     
     
         7 . The method of  claim 5  wherein the non-phosphorus extreme pressure agent is present at about 0.1 wt % to about 8 wt % of the lubricating composition. 
     
     
         8 . The method of  claim 1  wherein the mechanical device is a driveline device. 
     
     
         9 . The method of  claim 8  wherein the driveline device is selected from at least of the group consisting of an axle, a gear, a gearbox and a transmission. 
     
     
         10 . The method of  claim 9  wherein the transmission includes manual transmissions, continuously variable transmissions, infinitely variable transmissions, toroidal transmissions, continuously slipping torque converted clutches, automatic transmissions, stepped automatic transmissions, traction drive transmissions and dual clutch transmissions. 
     
     
         11 . The method of  claim 2  wherein the hydrocarbyl-capped polyoxyalkylene polyol is present in the lubricating composition at about 65 wt % to about 95 wt % of the lubricating composition. 
     
     
         12 . The method of  claim 2  wherein the hydrocarbyl-capped polyoxyalkylene polyol comprises (i) about 1 wt % to about 70 wt % of ethylene oxide, and an alkylene oxide containing about 3 to about 8 carbon atoms present at about 30 wt % to about 99 wt % of the hydrocarbyl-capped polyoxyalkylene polyol. 
     
     
         13 . The method of  claim 2  wherein the hydrocarbyl-capped polyoxyalkylene polyol comprises (i) about 5 wt % to about 60 wt % of ethylene oxide, and an alkylene oxide containing about 3 to about 8 carbon atoms present at about 40 wt % to about 95 wt % of the hydrocarbyl-capped polyoxyalkylene polyol. 
     
     
         14 . A method to impart fuel economy to a mechanical device comprising supplying to the mechanical device a lubricating composition comprising
 (a) about 1 wt % to about 99 wt % of the hydrocarbyl-capped polyoxyalkylene polyol, wherein the hydrocarbyl-capped group of the polyoxyalkylene polyol comprises a residue of a mixture of linear monohydric alcohols selected from the group consisting of dodecanol, tridecanol, tetradecanol and pentadecanol,   wherein the hydrocarbyl-capped polyoxyalkylene polyol comprises about 0 wt % to about 80 wt % of ethylene oxide, and an alkylene oxide containing about 3 to about 8 carbon atoms present at about 20 wt % to about 100 wt % of the hydrocarbyl-capped polyoxyalkylene polyol, and   wherein the hydrocarbyl-capped polyoxyalkylene polyol is present in the lubricating composition at about 50 wt % to about 95 wt % of the lubricating composition; and   (b) about 0.1 wt % to about 5 wt % of a phosphorus-containing acid, salt or ester, or mixtures thereof.